CVE-2015-1784Network attack vector

Code execution via double-extension custom CSS upload

Published Jul 7, 2022 · Updated Aug 6, 2024

Unrestricted file upload in NextGEN Gallery before 2.0.77.3 allows remote authenticated users to execute code via a crafted CSS file. The custom CSS uploader checks only the final .css suffix, so a name such as file.php.css passes validation while retaining an executable inner extension. Code execution requires access to the upload path and a web-server configuration, such as Apache with a matching AddHandler rule, that treats the inner extension as PHP.

CVSS severity8.8
High
EPSS probability2.02%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Unrestricted file upload in NextGEN Gallery before 2.0.77.3 allows remote authenticated users to execute code via a crafted CSS file. The custom CSS uploader checks only the final .css suffix, so a name such as file.php.css passes validation while retaining an executable inner extension. Code execution requires access to the upload path and a web-server configuration, such as Apache with a matching AddHandler rule, that treats the inner extension as PHP.

The record

CVE
CVE-2015-1784
Published
Jul 7, 2022
Updated
Aug 6, 2024
Vendor
Sandhills Development, LLC
Product
NextGEN Gallery
Classifications
CWE-434, T1190
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 7, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 6, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=nextgen-gallery 2.0.77.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Sandhills Development, LLC · NextGEN Galleryversion=nextgen-gallery 2.0.77.3

Published CVSS scores

8.8NIST National Vulnerability DatabaseCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
6.5NIST National Vulnerability DatabaseAV:N/AC:L/Au:S/C:P/I:P/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-434Unrestricted Upload of File with Dangerous Type
T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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